AUS-10 which is produced by Aich Steel. It has high carbon content just like VG-10, Ginsan-ko (Silver-3) which brings a great performance and razor sharp.
However, also means that the knives are relatively fragile. For that reasons a specific amount of nickel, manganese and silicon is added to the AUS-10 to improve the ductility and elasticity of the material.
AUS Steel holds a good edge and is fairly easy to sharpen. AUS-8 is tougher but is still easy to sharpen and holds a good edge.